The members carrying zero force (i.e. zero-force members) in the truss shown in the figure, for any lad P > 0 with no appreciable deformation of the truss (i.e. with no appreciable change in angles between the members), are
The members carrying zero force (i.e. zero-force members) in the truss shown in the figure, for any lad P > 0 with no appreciable deformation of the truss (i.e. with no appreciable change in angles between the members), are Correct Answer BF, DH, GC, CD and DE only
If at a joint 3 members meet out of which 2 are collinear then force in 3rd member will be zero provided there is no load/reaction at that joint.
∴ FGC = 0, FFB = 0 and FHD = 0
[ alt="F4 M.J Madhu 30.04.20 D5" src="//storage.googleapis.com/tb-img/production/20/05/F4_M.J_Madhu_30.04.20_D5.png" style="width: 436px; height: 110px;">
i.e. forces in the member GC, FB, HD is equal to zero
Now, considering joint E:
[ alt="F4 M.J Madhu 30.04.20 D6" src="//storage.googleapis.com/tb-img/production/20/05/F4_M.J_Madhu_30.04.20_D6.png" style="width: 169px; height: 137px;">
∵ FEH = RE
There is no horizontal force.
∴ FDE = 0
Also considering joint D, we can say that force in member CD = 0
[ src="//storage.googleapis.com/tb-img/production/20/05/F4_M.J_Madhu_30.04.20_D7.png" style="width: 256px; height: 93px;">